Bone stresses before and after insertion of two commercially available distal ulnar implants using finite element analysis

Our study only examined stresses

Rebecca L. Austman


Scholarcy highlights

  • Disorders of the distal radioulnar joint, such as arthritis, may be associated with pain, weakness, instability, and loss of forearm rotation
  • As the understanding of the biomechanics and load transfer characteristics of the DRUJ increases and improved implant designs with long-term follow-up studies become available, prosthetic replacement is likely to become the standard of care for managing the arthritic DRUJ
  • Implant design can greatly affect how load is transferred to the surrounding bone, which in turn can affect the degree of stress shielding, possibly affecting the implant’s lifespan
  • Studies investigating load transfer in the ulna and the role played by implant design characteristics should prove useful in predicting and improving the success of these implants
  • The length and diameter of the implant stems inserted were similar; the Wright implant stem is manufactured from titanium, which has an elastic modulus that is about half of the SBI implant’s cobalt chrome stem
  • Models run with the SBI stem set as titanium showed that this factor alone accounted for most of the differences in bone stresses
  • Our results suggest that for the loading situation and parameters investigated the titanium stemmed Wright implant may result in less stress shielding than the cobalt chrome SBI implant

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